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John,
I use a Baader Solar Film for white light observing.
I've trialed may different coloured filters as well a the usual DSO and narrow band filters to "improve" the image
Nothing, IMHO, worked as well as the Baader continuum in improving the contrast. A pale green filter was the second best.....none of the othere did much....
HTH
(I now have both the 1.25 and 2" Continuum filters fitted to the diagonals I use for white light observing on both a 4" refractor and the 12" Lx)
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